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Cash and cash equivalents (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash And Cash Equivalent [Line Items]        
Cash and cash equivalents $ 509,102 $ 588,530 $ 556,066 $ 630,438
Other current financial assets 348,069 505,490    
Other non-current financial hedge assets 51,925 8,778    
Other current financial liabilities (68,955) (291,128)    
Lease liabilities, current 5,528 7,694    
Other non-current financial liabilities (1,899,513) (1,488,723)    
Lease liabilities, non-current 25,546 30,203    
Total 1,105,095 719,810    
Net Debt [Member]        
Cash And Cash Equivalent [Line Items]        
Cash and cash equivalents 509,102 588,530    
Other current financial assets 348,069 505,490    
Other non-current financial hedge assets 37,276 3,918    
Other current financial liabilities (68,955) (291,128)    
Lease liabilities, current (5,528) (7,694)    
Other non-current financial liabilities (1,899,513) (1,488,723)    
Lease liabilities, non-current (25,546) (30,203)    
Total $ (1,105,095) $ (719,810)